PHY2 The University of Texas at Arlington Electrostatic Questions Hi, I have attached Physics 2 hw. I have due by 5 today (you don’t have to do number 3,5,

PHY2 The University of Texas at Arlington Electrostatic Questions Hi, I have attached Physics 2 hw. I have due by 5 today (you don’t have to do number 3,5,8,10,16) . I need correct answers to them. Thanks. singh (as98798) – Homework #2 – yu – (44020)
This print-out should have 22 questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering.
1
3. stay neutral.
4. lose electrons.
5. lose protons.
001 (part 1 of 2) 10.0 points
Consider three charges arranged as shown.
6.1 µC
4.9 µC
−4.1 µC
+
+
−
4.4 cm
5 cm
What is the magnitude of the electric field
strength at a point 2.6 cm to the left of the
middle charge? The value of the Coulomb
constant is 8.98755 × 109 N · m2 /C2 .
Answer in units of N/C.
005 10.0 points
When a positively charged conductor
touches a neutral conductor, the neutral conductor will
1. gain electrons.
2. gain protons.
m
004 10.0 points
The value of the electric field at a distance
of 84.8 m from a point charge is 20.8 N/C and
is directed radially in toward the charge.
What is the charge? The Coulomb constant
is 8.98755 × 109 N · m2 /C2 .
Answer in units of C.
q
4.9 m
003 10.0 points
You have a neutral balloon.
What is its charge after 12000 electrons
have been removed from it? The elemental
charge is 1.6 × 10−19 C.
Answer in units of µC.
5. 5
002 (part 2 of 2) 10.0 points
What is the magnitude of the force on a
−4.1 µC charge placed at this point?
Answer in units of N.
006 10.0 points
Three point charges are located at the vertices
of an equilateral triangle. The charge at the
top vertex of the triangle is given in the figure.
The two charges q at the bottom vertices of
the triangle are equal. A fourth charge 7 µC
is placed below the triangle on its symmetryaxis, and experiences a zero net force from
the other three charges, as shown in the figure
below.
−3.8 µC
q
7 µC
Find q . The value of the Coulomb constant
is 8.98755 × 109 N · m2 /C2 .
Answer in units of µC.
007 10.0 points
An airplane is flying through a thundercloud
at a height of 2030 m. (A very dangerous
thing to do because of updrafts, turbulence,
and the possibility of electric discharge.)
If there is a charge concentration of 53.2 C
at height 3230 m within the cloud and −29.7 C
at height 530 m, what is the magnitude of the
electric field E at the aircraft? The Coulomb
constant is 8.98755 × 109 N · m2 /C2 .
Answer in units of V/m.
008 10.0 points
1) Two uncharged metal balls, X and Y, each
stand on a glass rod and are touching.
singh (as98798) – Homework #2 – yu – (44020)
Y
X
2) A third ball carrying a negative charge, is
brought near the first two.
−
Y
X
3) While the positions of these balls are fixed,
ball X is connected to ground.
−
Y
X
4) Then the ground wire is disconnected.
−
Y
X
5) While X and Y remain in touch, the ball
carring the negative charge is removed.
Y
2
4.
qX is neutral and qY is negative
5.
qX is neutral and qY is positive
6.
qX is neutral and qY is neutral
7.
qX is negative and qY is neutral
8.
qX is positive and qY is negative
9.
qX is negative and qY is negative
009 10.0 points
Calculate the net charge on a substance consisting of a combination of 4.8 × 1013 protons
and 7.3×1013 electrons. The elemental charge
is 1.6 × 10−19 C.
Answer in units of C.
010 10.0 points
Consider a positive charge Q and a point B
twice as far away from Q as point A.
A
B
+Q
What is the ratio of the electric field
strength at point A to the electric field
strength at point B?
1. 8 to 1
X
2. 2 to 1
3. 1 to 1
6) Then ball X and Y are separated.
4. 1 to 2
Y
X
5. 4 to 1
After these procedures, what are the signs
of the charge qX on X and qY on Y?
1.
qX is negative and qY is positive
2.
qX is positive and qY is positive
3.
qX is positive and qY is neutral
011 (part 1 of 2) 10.0 points
Two identical small metal spheres with q1 > 0
and |q1 | > |q2 | attract each other with a force
of magnitude 93.4 mN when separated by a
distance of 1.02 m .
r1 = 42 µm
r2 = 42 µm
q1
F21
F12
1.02 m
q2
singh (as98798) – Homework #2 – yu – (44020)
The spheres are then brought together until
they are touching, enabling the spheres to
attain the same final charge q.
∆q
q1 → q
016 10.0 points
Why is a good conductor of electricity also a
good conductor of heat?
1. They all carry energies for both electricity
and heat.
q2 → q
After the charges on the spheres have come
to equilibrium, they spheres are separated so
that they are again 1.02 m apart.
F21
3
F12
q
q
1.02 m
Now the spheres repel each other with a force
of magnitude 22.416 mN.
What is the final charge on the sphere on
the right? The value of the Coulomb constant
is 8.98755 × 109 N · m2 /C2 .
Answer in units of µC.
012 (part 2 of 2) 10.0 points
What is the initial charge q1 on the first
sphere?
Answer in units of µC.
013 10.0 points
A particle of mass 86 g and charge 22 µC is
released from rest when it is 42 cm from a
second particle of charge −23 µC.
Determine the magnitude of the initial acceleration of the 86 g particle.
Answer in units of m/s2 .
014 (part 1 of 2) 10.0 points
A certain moving electron has a kinetic energy
of 0.997 × 10−19 J.
Calculate the speed necessary for the electron to have this energy. The mass of an
electron is 9.109 × 10−31 kg.
Answer in units of m/s.
015 (part 2 of 2) 10.0 points
Calculate the speed of a proton having a kinetic energy of 0.997 × 10−19 J and a mass of
1.673 × 10−27 kg.
Answer in units of m/s.
2. Bound electrons do not exist in materials
that are good conductors for both heat and
electricity.
3. For both electricity and heat, the conduction is via atoms, which in a metal are
loosely bound, easy flowing, and easy to start
moving.
4. If there is a current through a conductor, there should also be heat produced by
resistance.
5. For both electricity and heat, the conduction is via electrons, which in a metal are
loosely bound, easy flowing, and easy to start
moving.
017 (part 1 of 4) 10.0 points
Consider a disk of radius 4.8 cm with a uniformly distributed charge of +3.1 µC.
Compute the magnitude of the electric field
at a point on the axis and 3.3 mm from the
center. The value of the Coulomb constant is
8.98774 × 109 N · m2 /C2 .
Answer in units of N/C.
018 (part 2 of 4) 10.0 points
Compute the field from the near-field approximation x ≪ R .
Answer in units of N/C.
019 (part 3 of 4) 10.0 points
Compute the electric field at a point on the
axis and 32 cm from the center of the disk.
Answer in units of N/C.
020 (part 4 of 4) 10.0 points
Approximate the field by treating the disk as
a +3.1 µC point charge at a distance of 32 cm.
Answer in units of N/C.
singh (as98798) – Homework #2 – yu – (44020)
021 (part 1 of 2) 10.0 points
Two conducting spheres have identical radii.
Initially they have charges of opposite sign
and unequal magnitudes with the magnitude
of the positive charge larger than the magnitude of the negative charge. They attract
each other with a force of 0.244 N when separated by 0.4 m.
Initial
++
++
−
−
The spheres are suddenly connected by a thin
conducting wire, which is then removed.
Connected
+
+
Now the spheres repel each other with a force
of 0.035 N.
Final
+
+
What is the magnitude of the positive
charge?
Answer in units of C.
022 (part 2 of 2) 10.0 points
What is the negative charge?
Answer in units of C.
4

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